Process for the reduction of NH/sub 3/ in regeneration zone off gas by select recycle of certain-sized NH/sub 3/ decomposition catalysts
This patent describes a process for the fluidized catalytic cracking of a higher molecular weight hydrocarbon to a lower molecular weight hydrocarbon which process comprises: (a) contacting, in a cracking zone, the higher molecular weight hydrocarbon with a cracking catalyst, wherein the cracking catalyst becomes deactivated with coke deposits while being employed in the cracking; (b) withdrawing deactivated cracking catalyst particles from the cracking zone having the coke deposited thereon and passing the coked catalyst to a regeneration zone containing an ammonia decomposition catalyst and an inlet means for admission to the regeneration zone of a sufficient quantity of an oxygen-containing gas to operate the regeneration zone of partial combustion as defined by the presence of from 1 to 6 volume percent of CO in the regeneration zone; (c) containing the coke-deposited cracking catalyst with the oxygen-containing gas in the presence of the ammonia decomposition catalyst comprising a noble metal dispersed on an alumina support to form a regeneration zone effluent stream comprising spent regeneration gas, regenerated catalyst, and ammonia decomposition catalyst; (d) withdrawing the regeneration zone effluent stream from the regeneration zone and passing the regeneration zone effluent stream to a separation means wherein the spent regeneration gas, regenerated catalyst and ammonia decomposition catalyst are separated and wherein the spent regeneration gas is passed to a CO combustion zone.
- Assignee:
- Shell Oil Co., Houston, TX
- Patent Number(s):
- US 4755282
- OSTI ID:
- 6549191
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic cracking catalyst
Catalytic cracking using a cracking catalyst in admixture with particles of platinum group metal or rhenium on a substrate regenerated to up to about 0. 1% coke
Related Subjects
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
AMMONIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY
FLUIDS
GASES
HYDRIDES
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
KINETICS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
REACTION KINETICS
REDUCTION
REGENERATION
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
VAPORS
WATER VAPOR